To have, to realize that two Coca Cola bottles are not identical and what makes them not identical is that they're not at the same point. They can't be at the same point in space. Since they're not at the same point in space they automatically receive - each one receives light differently than the other, so that it can be as fascinating as going to a museum to look carefully, attentively at two Coca Cola bottles, hmm? And something of that is implicit in a great deal of 20th century art.
John Cage in an interview with Terry Gross on WHYY's Fresh Air.